1
Q
Choose formula
A
n!/r!(n-r)!
(nr)
2
Q
how to prove (n2)
A
n!/2!(n-2)! = n!/2(n-2)!
= n(n-1)/2
3
Q
f(x) + a
A
Move a units in the y direction up
4
Q
af(x)
A
Multiply the y values by a
5
Q
-f(x)
A
Reflection in y=0
6
Q
f(x+a)
A
Translation to the last by a units
7
Q
f(ax)
A
Enlargement of x values x 1/a
8
Q
f(-x)
A
Reflection in line x=0
9
Q
Asymptotes when f(x) = k/mx-a +c
A
2 asymptotes
Horizontal asymptote at y=c
Vertical asymptote at mx-a = 0
10
Q
describe graph of y =1/x
A
Top right curve and bottom left curve
11
Q
describe graph of y = -2/x
A
One in top left and one in bottom right
12
Q
describe graph of k/x^2
A
Both curves in top
13
Q
describe graph of y = -5/x^2
A
Both graphs in bottom
A Level Maths AQA
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